An Astragal

1. (anatomy) Synonym of astragalus: the bone forming the ball of the ankle joint.
2. (plural only) Synonym of dice.
3. (architecture) A semicircular molding separating the architrave at the top or bottom of a column.
4. A tool used to mold such features; similar tools used for connecting panes of glass in a window.
5. (weaponry) A circular molding near the mouth of a cannon.
6. (botany) Synonym of locoweed of the genus Astragalus.
7. (architecture) A molding attached to double doors to prevent drafts.
8. (roof plumbing) A bracket used to fix downpipes to the wall of a building.